(NewsUSA) – Video gamers who participate in marathon sessions may be putting their health at risk. In May 2011, a 20-year-old video gamer from England died when a blood clot formed in his leg and moved to his lungs. The man often remained in the same position playing video games for 12 hours straight.

“Movement is essential for proper blood flow,” said Anil Hingorani, MD, a member of the Society for Vascular Surgery. “Sitting in the same position for long periods of time—whether playing video games or cramped in a car or on an airplane—can result in pooling of the blood in the veins. Blood clots known as deep vein thromboses (DVT) can form.”

The 2011 Centers for Disease Control and Prevention statistics reveal that 300,000 to 600,000 Americans die each year from blood clots in the lungs. In 2003, 39-year-old NBC News reporter David Bloom died when a blood clot in his leg traveled to his lungs. The clot formed after weeks of driving around Baghdad in a cramped military tank.